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Children play near one of the sculptures of an exhibition called "Guns for Peace" at Bishopric Hill in Monterrey, Nuevo Leon state, Mexico on March 31, 2015. "Guns for Peace" is part of a project of sculptures called "No Violence" done by different artists around the world. The project originally was created by Japanese multimedia artist Yoko Ono as a memorial tribute to British musician John Lennon after he was shot dead on December 8th, 1980 in New York City. AFP PHOTO/ JULIO CESAR AGUILARJulio Cesar Aguilar/AFP/Getty Images